Faxon Firearms Bantam 16 in Complete Upper Receiver, 9Mm, FX916-U

Ghost Firearms Vital Upper Receiver, Pistol Lower Parts Kit, 5.56Mm, 10.5In, Carbine , 4150 M4 Barrel, 1-7 Twist, 9in M-LOK Free Float Hand Guard, A2 Birdcage Flash Hider, Black, GF105E9GFR556BLK-KIT

Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56Mm, 16 Inch Barrel, Mid-Length Profile, 1-9 Twist, 1/2-28 Thread, A2 Flash Hider W/Gas Block, Black, AR0388B

Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56Mm, 20 Inch Barrel, Standart Profile, 1-9 Twist, 1/2-28 Thread, A2 Handguard, A2 Flash Hider W/Gas Block, Black, AR0450B

Rock River Arms Completed Pistol Upper Receiver, A4 .223/5.56Mm, 16 Inch Barrel, Mid-Length Profile, 1-9 Twist, 1/2-28 Thread, A2 Flash Hider, Black, AR0375B

Stag Arms AR-15 Tactical Upper Receiver, 5.56x45mm NATO, 16in Barrel, Maryland Compliant, Hanson Profile, 1-7 Twist, 1/2X28, Left Hand, VG6 Delta, Nitride, Black, STAG15110146

Ghost Firearms Upper Receiver, Rifle Lower Parts Kit, 5.56Mm, 16In, Carbine , 4150 Chrome Moly Steel Barrel, 1-7 Twist, 14in M-LOK Free Float Hand Guard, A2 Flash Hider, OD Green, GF16E14GFR556OD-KIT

Stag Arms AR-15 3-Gun Elite Right Handupper Receiver, 5.56 NATO, 18in Barrel, NJ Compliant, Heavy-Fluted Profile, 1-8 Twist, VG6 Gamma, Black, STAG15100613

Stag Arms AR-15 3-Gun Elite Right Handupper Receiver, 5.56 NATO, 18in Barrel, Heavy-Fluted Profile, 1-8 Twist, VG6 Gamma, Black, STAG15100611

Stag Arms AR-15 Upper Right Hand Receiver, 5.56 NATO, 16in Barrel, NJ Compliant, M4 Profile, 1-7 Twist, 1/2 X 28 Thread, Compensator, Black, STAG15101113

Ghost Firearms Vital Complete Upper Receiver, .300 Blackout, 16In, Pistol Length, 4150 Light HBAR Barrel, 1-8 Twist, 11in M-LOK Free Float Hand Guard, A2 Birdcage Flash Hider, Black, GF16V11GFR300

Ghost Firearms Complete Upper Receiver, Pistol Lower Parts Kit, 5.56Mm, 7.5In, Pistol , 4150 M4 Barrel, 1-7 Twist, 9in M-LOK Free Float Hand Guard, Flash Can, Tungsten Gray, GF75GFR9FCAN556TG-KIT

Ghost Firearms Elite Complete Upper Receiver, .300 Blackout, 16In, Pistol , 4150 Light HBAR Barrel, 1-8 Twist, 14in M-LOK Free Float Hand Guard, A2 Muzzle Device, Flat Dark Earth, GF16E14GFR300FDE

Faxon Firearms Faxon AR-15 Stripped Upper Receiver, Type II, M16, Nitrided, Bolt Carrier Group BCG, FF65GBCGCNITRIDE, UR-FAX-F-A-S

Ghost Firearms Upper Receiver, Rifle Lower Parts Kit, 9mm 9X19 Para, 16In, Carbine , Light HBAR Barrel, 1-10 Twist, 14in M-LOK Free Float Hand Guard, A2 Muzzle Device, OD Green, GF16E14GFR9MMOD-KIT